MPL 20x3x2 / N38 - lamellar magnet
lamellar magnet
Catalog no 020130
GTIN/EAN: 5906301811367
length
20 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.9 g
Magnetization Direction
↑ axial
Load capacity
2.33 kg / 22.90 N
Magnetic Induction
370.68 mT / 3707 Gs
Coating
[NiCuNi] Nickel
0.394 ZŁ with VAT / pcs + price for transport
0.320 ZŁ net + 23% VAT / pcs
bulk discounts:
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Product card - MPL 20x3x2 / N38 - lamellar magnet
Specification / characteristics - MPL 20x3x2 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020130 |
| GTIN/EAN | 5906301811367 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 3 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 0.9 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.33 kg / 22.90 N |
| Magnetic Induction ~ ? | 370.68 mT / 3707 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| remenance Br [min. - max.] ? | 12.2-12.6 | kGs |
| remenance Br [min. - max.] ? | 1220-1260 | mT |
| coercivity bHc ? | 10.8-11.5 | kOe |
| coercivity bHc ? | 860-915 | kA/m |
| actual internal force iHc | ≥ 12 | kOe |
| actual internal force iHc | ≥ 955 | kA/m |
| energy density [min. - max.] ? | 36-38 | BH max MGOe |
| energy density [min. - max.] ? | 287-303 | BH max KJ/m |
| max. temperature ? | ≤ 80 | °C |
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
| properties | values | units |
|---|---|---|
| Vickers hardness | ≥550 | Hv |
| Density | ≥7.4 | g/cm3 |
| Curie Temperature TC | 312 - 380 | °C |
| Curie Temperature TF | 593 - 716 | °F |
| Specific resistance | 150 | μΩ⋅cm |
| Bending strength | 250 | MPa |
| Compressive strength | 1000~1100 | MPa |
| Thermal expansion parallel (∥) to orientation (M) | (3-4) x 10-6 | °C-1 |
| Thermal expansion perpendicular (⊥) to orientation (M) | -(1-3) x 10-6 | °C-1 |
| Young's modulus | 1.7 x 104 | kg/mm² |
Technical analysis of the assembly - data
These data represent the outcome of a physical simulation. Values were calculated on models for the material Nd2Fe14B. Operational performance might slightly differ. Use these data as a reference point during assembly planning.
Table 1: Static force (force vs gap) - characteristics
MPL 20x3x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3700 Gs
370.0 mT
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
warning |
| 1 mm |
2103 Gs
210.3 mT
|
0.75 kg / 1.66 pounds
752.3 g / 7.4 N
|
low risk |
| 2 mm |
1172 Gs
117.2 mT
|
0.23 kg / 0.52 pounds
233.7 g / 2.3 N
|
low risk |
| 3 mm |
721 Gs
72.1 mT
|
0.09 kg / 0.20 pounds
88.5 g / 0.9 N
|
low risk |
| 5 mm |
345 Gs
34.5 mT
|
0.02 kg / 0.04 pounds
20.3 g / 0.2 N
|
low risk |
| 10 mm |
101 Gs
10.1 mT
|
0.00 kg / 0.00 pounds
1.7 g / 0.0 N
|
low risk |
| 15 mm |
42 Gs
4.2 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
low risk |
| 20 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
low risk |
| 30 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical hold (wall)
MPL 20x3x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.47 kg / 1.03 pounds
466.0 g / 4.6 N
|
| 1 mm | Stal (~0.2) |
0.15 kg / 0.33 pounds
150.0 g / 1.5 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.10 pounds
46.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
18.0 g / 0.2 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - vertical pull
MPL 20x3x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.70 kg / 1.54 pounds
699.0 g / 6.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.47 kg / 1.03 pounds
466.0 g / 4.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x3x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
|
| 1 mm |
|
0.58 kg / 1.28 pounds
582.5 g / 5.7 N
|
| 2 mm |
|
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
|
| 3 mm |
|
1.75 kg / 3.85 pounds
1747.5 g / 17.1 N
|
| 5 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 10 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 11 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 12 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MPL 20x3x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
OK |
| 40 °C | -2.2% |
2.28 kg / 5.02 pounds
2278.7 g / 22.4 N
|
OK |
| 60 °C | -4.4% |
2.23 kg / 4.91 pounds
2227.5 g / 21.9 N
|
|
| 80 °C | -6.6% |
2.18 kg / 4.80 pounds
2176.2 g / 21.3 N
|
|
| 100 °C | -28.8% |
1.66 kg / 3.66 pounds
1659.0 g / 16.3 N
|
Table 6: Two magnets (repulsion) - field range
MPL 20x3x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
5.06 kg / 11.17 pounds
4 866 Gs
|
0.76 kg / 1.67 pounds
760 g / 7.5 N
|
N/A |
| 1 mm |
3.01 kg / 6.64 pounds
5 705 Gs
|
0.45 kg / 1.00 pounds
452 g / 4.4 N
|
2.71 kg / 5.97 pounds
~0 Gs
|
| 2 mm |
1.64 kg / 3.61 pounds
4 205 Gs
|
0.25 kg / 0.54 pounds
245 g / 2.4 N
|
1.47 kg / 3.24 pounds
~0 Gs
|
| 3 mm |
0.89 kg / 1.97 pounds
3 106 Gs
|
0.13 kg / 0.29 pounds
134 g / 1.3 N
|
0.80 kg / 1.77 pounds
~0 Gs
|
| 5 mm |
0.31 kg / 0.67 pounds
1 816 Gs
|
0.05 kg / 0.10 pounds
46 g / 0.4 N
|
0.27 kg / 0.61 pounds
~0 Gs
|
| 10 mm |
0.04 kg / 0.10 pounds
690 Gs
|
0.01 kg / 0.01 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 pounds
202 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
24 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
14 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
9 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
6 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
5 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
3 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 20x3x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Remote | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Collisions (cracking risk) - collision effects
MPL 20x3x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
51.34 km/h
(14.26 m/s)
|
0.09 J | |
| 30 mm |
88.88 km/h
(24.69 m/s)
|
0.27 J | |
| 50 mm |
114.74 km/h
(31.87 m/s)
|
0.46 J | |
| 100 mm |
162.27 km/h
(45.08 m/s)
|
0.91 J |
Table 9: Surface protection spec
MPL 20x3x2 / N38
| Technical parameter | Value / Description |
|---|---|
| Coating type | [NiCuNi] Nickel |
| Layer structure | Nickel - Copper - Nickel |
| Layer thickness | 10-20 µm |
| Salt spray test (SST) ? | 24 h |
| Recommended environment | Indoors only (dry) |
Table 10: Electrical data (Flux)
MPL 20x3x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 748 Mx | 17.5 µWb |
| Pc Coefficient | 0.32 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 20x3x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.33 kg | Standard |
| Water (riverbed) |
2.67 kg
(+0.34 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical wall, the magnet retains merely ~20% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically weakens the holding force.
3. Temperature resistance
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.32
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.
Chemical composition
| iron (Fe) | 64% – 68% |
| neodymium (Nd) | 29% – 32% |
| boron (B) | 1.1% – 1.2% |
| dysprosium (Dy) | 0.5% – 2.0% |
| coating (Ni-Cu-Ni) | < 0.05% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths as well as weaknesses of rare earth magnets.
Strengths
- Their power is maintained, and after approximately ten years it decreases only by ~1% (according to research),
- Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
- In other words, due to the shiny surface of gold, the element looks attractive,
- Magnetic induction on the top side of the magnet is maximum,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
- Thanks to the option of free molding and adaptation to individualized needs, magnetic components can be produced in a wide range of forms and dimensions, which makes them more universal,
- Wide application in electronics industry – they find application in mass storage devices, motor assemblies, precision medical tools, as well as technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems
Cons
- They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in creating threads and complex forms in magnets, we recommend using cover - magnetic mount.
- Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Lifting parameters
Maximum holding power of the magnet – what it depends on?
- on a plate made of structural steel, perfectly concentrating the magnetic field
- with a cross-section no less than 10 mm
- characterized by smoothness
- with total lack of distance (without coatings)
- for force applied at a right angle (in the magnet axis)
- at conditions approx. 20°C
Magnet lifting force in use – key factors
- Clearance – the presence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Metal type – different alloys attracts identically. Alloy additives weaken the attraction effect.
- Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.
Warnings
Finger safety
Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
Maximum temperature
Do not overheat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).
Adults only
Neodymium magnets are not toys. Swallowing multiple magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.
Health Danger
Patients with a pacemaker have to keep an absolute distance from magnets. The magnetic field can stop the functioning of the implant.
Magnetic interference
A powerful magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Keep magnets near a device to prevent damaging the sensors.
Protect data
Data protection: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).
Handling rules
Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.
Fire risk
Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Skin irritation risks
A percentage of the population experience a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching may cause dermatitis. We suggest wear protective gloves.
Magnet fragility
Neodymium magnets are ceramic materials, which means they are very brittle. Clashing of two magnets leads to them breaking into shards.
